Vampiric Tether

You point at a creature within range of 120ft. This creates a tether between you, and said creature transferring life from it to you. Upon casting this spell, you do 6d8 damage dealing an extra 5d8 for each round that passes, giving you half the amount of hitpoints that were drained from said creature. This does not affect Undead, Constructs or any other being without blood.